Rotary valve.



l.. 109.134. 'v Mmmm: sm'. 1n. 190s.

J. n.v nALmolc.

ROTARY VALVE. umani" mi m41. ma.

I IBSN-Illu' l.

' KI mmnto/L.

CU fin se.

l. 7.9mm. y rA'rBN'rsn snm'. 12, 1905.

J. D. BALDICK.

ROTARY VALVE.

l unieuro! nun 01.41.1905.

2 SHEETS-IIN?! l.

. v dumme,

WST Mmmm copy JOHN l). BALDICK, 0F BLACK RIVER, NEW YORK.

ROTARY VALVE.

In. md.

Ipociil'cation of Lettera Patent.

Patented Sept. 12, 1905.

lpplieatln 4lloc! larsl 31, 1.06. Isrfal le. 263,072. y

To all whom it my concern.:

Be it known that I, Jona l). Baumes., a citizen of the United States, residing at Black River, in the county of Jefferson and State of New York, have invented certain new and useful Improvements in Rotary Valves, of which the following is a specification.

This invention relates to improvements in rotary valves designed for use in connection.

with hydraulic grinders employed in the manufacture of wood-pulp; and the invention' relates particularly to improvements in valvesemployed in connection with thatclass of grinders which are provided with multiple pockets and having operating-cylinders connected therewith, the several pockets being disposed around or above a revolving stone, upon or against which the wood is held by means of hydraulic pressure exerted by the cylindersand in which different degrees of water or other pressa rc are employed to effect the various workings of the grinding-machines. y

The object of this invention is to provide a valve which is capable of supplying either a high or a low pressure to the grinder-cylinders and which may be adjusted in a quick and ready manner by means of an index or gage and a lever to vary the degree of pressure on different parts lof the grinding-nutcliine, as well as to cause the discharge of the water or other fluid from the cylinders without any alteration of the luachlne itself or any appre-v ciable delay in operating the same.

A prominent feature of the invention consists in providing a valve comprising an oblong cylindrical member or plug which is incased in a tight fitting jacket or case provided with perforations and which is capable of being revolved in either direetio'h at will tov effect the desired adjustment or purpose.

Other features and parts of the invention will be more read'ily understood by reference to the drawings forming a part of this speci--- lication, and in which f- Figure t is a side elevatlon of' my improved rotary valve, showing the two receiving, the two'discharge, and the waste-pipe connections and also showing the lever or handle for operating the valve. Fig. 2 is a front en d elcvation of the said valve, showing the valveoperating lever and also thev index or gage used for setting the valve. Fig. 3 is a vertical section of the valve-body on the line l u of Fig. 2, showing tlr.: valveplug in elevation and also showing the discharge and waste ports and the manner of constructing and applying the water-tight couplings for the same. Fig. 4 is a sectional view of the valve substantially on the line .n .n of Fig. Si, show- 6o ing thc several ports and ducts for the passage of the water. Fig. 5 is a sectional view of the valve substantially on the line ql/vof Fig.

3. showing the duct A. Fig. 6 is a-sectional y view of the valve on the line z s of Fig.- 3, showing the ducts Band G and also, discharge duct or passage in the center vof the core. Fig. 7 is an elevation of a triple-pocket grind ing-machine, showing one cylinder and pocket in section and the manner of connecting the 1o va passage for the water-pressure from rotary valve to the cylinder. Fig. H la an elevation of the tubular jacket which incases the valve-core, showing the general arrangement of the groups of perforatious for straining the water. Fig. 9 is au enlarged detail 75 in section of the coupling parts. Fig. lo is an elevation of the follou'er used in connection with the water-tight coupling.

Similar reference numerals and characters are given to correslmnding parts throughout 8o the several figures of the drawings. and in which the casing 2 is preferably made of cast iron, cylindrical in form, and having one open v end 3, which is provided with the flange 4, to which issecured the head by means of suit- 85 able bolts, a gasket being placed between flange 4 and head ',lhe case 2 is chambered or bored out to receive a cylindrical valve plug or core (i, wh ich is preferably nuule of cast iron aml substantially solid, as shown in the draw-r ings. 'lhc plug or core 6 is provided atone end with a gudgeon or shaft 7, which is preferably a piece of steel, around oneend of which the casting is formed, and which serves as a journal for one end of the val'vc to revolve 95 upon. ',lhe shaft 7 has its bearing in the head 5, upon which is the stuffing-Ixix or packinggland ti. 'lhe other end of valve (i is provided with anenlarged hublke projection i), which is uscd'also as a journal and has its bearings loo in the closed end l0 of the casing 2.

'lhc case or shell 2 is provided with thedischarge ports or alan-turcs l2 vand 13, located centrally on its upper and lowersides, respectively. Y 'lhese ports are eachintendcd to form |05 the vulve-.chamber ll to the grimlel'c \'limler by means of the intervening connections hereinaftcrset forth. 'lhe port l2 is connected with the top of the cylinder uml port. 13 with the 11 bottom of the cylinder. 'lhc case or `shell 2 is also provided ou one side, Fig. l. with the suitable piping, port l communicating with thehigh-.pressure and port 16 with the lowpressure pump.

It will be noticed that the rotary valve herein shown and described is intended to be used in connection with both high and low pressure service, the valve being constructed so as to facilitate the elnployment of either of said pressures, as may be desired.

The plug 6 is provided upon its outer surface with a series of spirall,`vshaped duets or recesses A, B, and C. which are preferably formed in the casting inthe manner shown in Figs. 3, 4, 5, and 6. These ducts are intended to serve as passages'for the water from the receiving-ports to the discharge-ports of the valve on its way to the grinder-cylinders. The center of core or plug 6 is bored out about half its length, as shown by dotted lines in Fig. 3, to form the discharge-passage or exhaast-duct 20. corresponding with the orifice 21, which is formed in the closed end 10 of the easing 2, and to which the waste-pipe 22 is yjoined by means of ordinary*pipe-thrcmls.

The plug 6 is also provided with a series of cross ports or ducts 23, 24, and 25, all of which converge toward the centerv of said plug and connect with the port or passage 20. By the use of these creas-wrm the waterpressure may bc drawn or discharged from either end of the grinder-cylinder when the valve-plug 6 is set in a position to accomplish the same. The valve-core 6 is further provided with a metallic jacket or casing 26, preferably in the form of a brass or bronze tubing, made to tit 'the core tightly so as to operate therewith.

The said jacket extends the full length of the valve-core and when mounted upon the latter is intended to operatively lit the hollow space or chamber ll of the valve-casing 2; 'lhe said jacket or casing 26 is provided with a series of perforations opposite each of the sev- -eral ports and at each end of the spi rally-shaped ducts, as indicated by the nmneral 27. These perforations are provided for the purpose of preventing foreign substances from entering the valve or grinding-cylinder and interfering with the workings of these parts. The valve core and casing can be taken out from time to time by removing the head 5, and the valve and chamber may then be cleansed.

The shaft or gudgeon 7 projects outwardly several inches beyond the head 5, uml its outer end is squared to receive the valve-operating lever or handle 29, which is attached to lsaid shaft by means of the yoke 30 and the pin 3l. A spring 32 is anchored to the end of shaft i' and is held in place by the screw 33. 'lhis lever or handle is used to operate the valve l or plug ti --that is, to rotate tho saillie for the pur ose of setting tho valvel in the several |um|tions necessary to direct tho high or low water-'pressure to the different parts ofl the grinding-cylinder. An annular gage or index 35 is cast or formed upon the face side of the head 5 eoncentrically with shaft 'i' and valve 6, as shown in Figs. l, 2, and 3. This gage or ring is provided with the notches or graduations A', li', and (1', which are intended to correspond with the ducts A,`B, and C of thc valve-plug 6 and are placed at equal distances from each otheras shown in Fig. 2. These notches or gage-marks are employed in connection with the lever 29 in setting the valve in the several positions just described, aml the spring 32 is intended to exert its tension so as to hold the lever 29 in the said notches.

ln order to illustrate the use of the lever and gage referred to, it may be assumed that the pocket of the grinder is lilled with wood ready for grinding and that the lever 29 is set inthe notch A'. This will place the valveplug and jacket so that the perforaticns over the port or duet A of said plug at the point marked l) in Figs. 3 and 8 will be directly opposite the inlet-port l5. 'l`hen the high pressure from the pump will entelduct A uml pass out through the perforations in the jacket. 26 at the other end of said duet, through the port l2, tube 4o, uml the pipe 49, to the top of the cylinder 5U and exert its force -against the piston-head 53, uml thereby drive and hold the piston-rod 54 and follower against the piece of the wood 56 which bears upon thegrinding-stone 58, as illustrated in Fig. 7 of the drawings. lly turning the lever to the next point on the indicator, it reverses the pressure, cuts ofi tho high pressure from the top of the cylinder, and places the discharge or cross port. 23 in the valve-core oppositel to port l2 of the casiugz! v to draw water from top .of cylinder, uml at the same time turns the low pressure into the bottom of cylinder, raises the pressure-finit or follower 55, und thus allows the pocket to be lilled again. 'lhen" by turning the lever to C', the third point on the imlicator, it reverses the low pressure, applies the low pressure to the top of thel cylinder` uml places discharge-mrt 24 opposite port 13 at tlu` bottom of the valve-casing 2. forces the pressure foot or follower 55 down ou the wood, and by this means it keeps the high pressure on theothercylndersataunl'ormpoint. When the follower or pressure-fmt is again bearing on the wood in pocket and ready to grind, the lever 29 should he turned to the lirst position A', thus` changing tlu` pressure on top ol' the cylinder from loa to high alul opening discharge-port 25 uml 13 at the bottom ol `falve-lxxly to complete the draining ot' water from the lower part of the cylinder without reducing the high pressure.

Where two or more grinders are lworking from the sumo pump system, as is generally thc raso, theI olwrutiou above losrrilud will.

l'lhe pressure having been relieved from the ing pulp, because it will permit of thefull hlgh pressure being kept on the other grinders during the interval in which the empty pocket is being retilled. It is an object of my improved valve to provide for the raising and lowering of the piston and follower at the time of the retilling of a pocket by the employment of the low pressure alone, as described, and under the construction herein shown and described this can be done without lose of time and without reducing or disturbing the hizh pressure exerted on the other pockets. n casco! low water, when the speed of th`e grinder is slow, one or more cylinders and pockets may be operated on low pressure altogether, thus deriving the full benelit of the power instead of cutting olf some of the pockets, as must be done in the case of the old valves now in use. My improved valve may be revolved in either direction freely and produce the same results, and it may be used iu connection with a single-pump system by connecting the pump to the low-pressure inlet 16 and then working the lever 29 back and forth on the indicator or gage 3f from one lowpressure notch B' to the other, L2'. When lever 29 is at A', the high pressure ls on the top of the piston or cylinder 50. When it is desired to draw the water f roni the top of the piston or cylinder, the operator turns lever 29 to the notch ll'. of the indicator. 'lhen the water will pase back through the pipe 4h and port 12 into the cross-port 23 of the valve-plug by filtering through the perforations 2 of the jackets 26, thence into discharge-passage 20 and through port 21 into .waste-pipe 22, and the lever 20, being at B', opens` the passage from the low-pressure pump through the pipe 48 into the receiving-mrt 11', thence through the duct B and down through port 13 and the pipe 59 into the cylinder beneath the piston.

top of piston by the opening of discharge-passage 23, as just described, the low pressure will immediately exert itself to raise the piston, and with it the follower, away from the grinder, and the pocket may then be refilled with fresh wood for another grinding. After a. pocket has' been rellled, with wood the operster, in order to econolnize in the. usev of the pressure-that is, in order not to disturb the high resi-iure used on the other grinders should turn the lever 20 around to notch t2', and by so doing the water which has been forced into the lower part of the cylinder to raise the piston and follower will be relieved ordischarged by returning through pipe 59 e and port 13 into cross-dnet24 of valve ti and i thence through dischargepassage 2u into waste-pipe 22. While the water is being discharged from the lower part of cylinder. as t described, the valve till remaining set. at C", thc low pressure is t iverted to the top of the piston for the purpose of driving thel piston uml follower down on the new wood placed in l pressure maybe kept on bular part 4H,

the pocket.` By this means the low pressure is utilized tooperate the follower when butslight force or power is required to move the light parts to make ready for grinding. and tbc high the other cylinders, which may be grinding during all this time. To get the low pressure into the top of cylinder, as lastdescribed, the water will flow from the pipe 48 through port 16 into the spiral duct C, thence through the jacket 21S into port 12 and pi m40 intocylinder at 50'. Assoon as the fo lower has been placed on the wood the lever 20 is swung around to A'. lirst position, and that causes the high pressure to again be placed on top of cylinder and the grinding resumed under the high pressure.

'.lhe casing 2v is provided with a series of bosses or raised projections 36, which are formed on its outer surface, as shown in Figs. l, 2. and 3. 'lhesc bosses are disposed concentrically with the ports l2, 13, l5, and 11i and are intended to provide a solid and level connecting-bed for the water-tight packingboxorcoupling3. 'lhepackiiig-lmx'orcoupling 37is composed of a cap or bridge 38, which lits n ion and is secured to the boss 31' by means o the cap-screw 3th. 'lhe bridge 38, as `shown in elevation in Figs. l and 2 and in section in Fig. 3, is provided with the ccntl'ul tubular portion 4u, which is internally threaded at its outer end to receive a section of pipe, as 47, 48, 49, and 59, and its inner end extends through boss 31 and forms in each instance the ports leading from the pumps to the valve-chamber and from said chamber to the grinding-cylinder. 'l`he tube or hollow portion 41) is coneuvrd at its inner ond to con form to the'cirelc or curveot' the vulve-rhumbcr ll and also the vulve 1 and is intended in euch instance to bear against the jacket 21' of the valve-plug, so as to make as nearly as possible a close-fitting joint. Boss :51S is bored out at 36" considerably larger tlum the tubular part 41', so as to provide for the insertion oi' usuitabh` gasketor |ackingiuaterial l2 around said part 41). and inorder to compress and hold the lsaid packing material in place against the vcurving surfaceof the valve-coreaial the tube 4t) l provide a follower 43, preferably ill the forln shown in Figs. .i-and 11i, und l also provide the annular lult or gland 44. which is intended to force und hohl the follower down on 'the packing. 'lhc annular nut tt is rxlcrnally threaded to engage the threads in the outer end of the aperture 313', formed in the boss 31. 'l`he nut or gland -H is bored out internally, so as'to slidably lit the tubular purl 41). ln assembling these coupling partsthe uut-i-iand the l'ollowrr-liuril placcdnpon the tube 41D and the latter inserti-d into the port ol' aperture 313', und then bolts 3.' are tightened up, the packing is placed around tln` tuand then the follower -ii is placed on the parking, und the nut 4i is thon screwed down by meansol' a spunnrr-wrench.

' formed ao as to be perfectly water-tight, and

` anism, and any waste through imperfect coupto hold said lever when so set, substantially 6 5 o r core, a series of perforations in said jacket i prising l litting said plug or core, perforations in said said liy'this means a coupling or joint is formed winch will not leak. ln a rotary valve of this claas it is important that all the couplings are the pur ose of this particular form of coupling a packing is to prevent the water as it passes under pressure from the pumps through the various ports and ducts on its way to the cylinder from leaking out or escaping either into the valve-chamber ll at the point where the perforated jacket meets the several porte in the casing 2 or to the outside of the valve-body at any of the points where such joints or couplings are m e. As a rule the amount of pressure supplied by the pumps` is rarely in excess of what is required to carry out the perfect workingof the grinding mechling or packing, however slight it may be, will interfere with the work with thc grinders. and for that reason I have devised the couplings herein shown and described.

Obviously the detail construction of the mechanism as herein shown and .described may be altered without departing from the spirit of my invention, and l therefore do not coniine the same to the specitic form and arrangement of parte herein shown.

Havingthusdescribed my invention, what I claim as new, and desire to secure by Letters Patent, isi l. A rotary valve of the class described, comprising a cylindrical easing having one open and one closed end, a plurality of receiving and discharge ports formed therein, acore or plug journaled in said casing, spirallyshaped ducts or recesses formed. in the surface of said plug or core, a central discharge pasmge orductdisjmsed longitudimtlly of said plug or core, cross ports or ducts converging to and connecting with said central discharge passage orduct, a tubular jacket or case tightly i jacket or case adapted to be disposed between the ducts and ports of said plug or core and the ports of said casing, an annular index or gage formed upon the face oi' said casing, notches or graduationsformed in said index or gage, a lever connected with, and adapted to operate said plug or core and to be set in said notches or graduations, and a spring adapted as described. o

2. A' rotar.' valve of the class described, comprising a hollow casing having a detachi able head and a plurality of inlet and outlet ports, a cylindrical plu.` or core journalist in casing, a series of spirally-shaped recesses or ducts formed in the surface of said core or plug, a central discharge passage or duct extendinglengthwise of said plugor core, cross ports or passages converging to and connecting with said central discharge passage or duct, a jacket or casing surroumling said plug remet or casing, adapted to straina luid passing from said. inlet to said outlet-ports, and provided with meansfor preventing the leakage or esca cof the water or other ilu id as it'passes throug i said ports and ducts, an annular gage or index formed upon said detachable head, a series of notches or gage-marks formed in said annular gage or index, and a lever or handle connected with said core or`plug and adapted to be operated to rotate and set said plug or core in a number of ditl'erent positions, substantially as described. f

8. A rotary valve of thc class described, comprising'a cylindrical casing having a detachable head upon one end and a waste-port at the other end, a series of receiving-portsn one side of said easing, a pair of oppositelydisposed discharge-ports formed in said casing, apaeking box or coupling secured to said `casing and disposed concentrically with each of said receiving and discharge ports, means. comprising a gasket, a follower, and a glandnut for preventing the `escape or leakage of a fluid-pressure around sa-id ports, a valve plug or core journaled inthe ends of said casing, spirally-shapcd grooves or ducts formed in the surface of said plug or core, adapted to conduct a Huid-'pressure froln said receivingv ports to said discharge-ports, a series of cross ducts or passages converging toward' the ccnter of said plug `or core, a central dischargepassage in said plug or core forming a connection between said crossports and said waste-wrt, a perforated tubular jacket or casing tightly iitting said plug orcore and adapted to operate therewith. a shaft or gudgeon lOO on one end of said plugor core, an operatinglever connected to said shaft or gudgeon, an annular gage or imlexfmmwd upon the head of said casing, aseries of notches in saidgage or index, adapted forindieating the diticrent positions in which said valve plug or core may be set, substantially as described.

4. ln a rotary valve of the class described, the combination with a cylindrical casing and a plurality of receiving and discharge ports, of an oblong eyrlimlrical plug or core incased in a tubular jacket and adapted to operatively lit the interior of said casing, spirally-shaped reeesses or ducts formed in said plug or core beneath said jacket, discharge passages or ducts extending from lthe. outer surface to the eenter of said plug or core. a discharge or waste, passage extending from one end to the middle of said plug or core, groups of iarforatous arranged on said jacket through which a iluidpressure is adapted toilow, packing-boxes to prevent the leakage of water or other tluid around said receivingaml discharge ports, an

operating-lever connected to said plug or et we.

and an indes or gage to indicate the variousA lmsitious of said plug or core, substantially as described.

A rotary vaiveof theclassdcsc|ibed.eo|n a cylinder having one flanged end and a detachable head secured thereto.acylindrical l hollow casing provided with a series of replug having a from the center ot said plug, a central discharge-passage intersecting said cross-ports and extending to the end of said plug, a port in thcend ot said cylinder connecting with said central diachargereceivln or inlet ports arranged in said cy inder and ai apted to connect with said ducts or grooves, discharge or outlet ports in said cylinder adapted to connect with said ducts or grooves and also with said cross-ports, packing boxes or coup I5 lings connected with said receiving and discharge ports, an annular gage upon said detachable head, index-notches in said gage, and a lever or crank for operating said plug and adapted to be set in said index-notclies, substantially as described.

6. A rotary valve of the class described,com prisingacylinderliavin one llangcd end und a detachable head secu thereto,aeylindrieal plug having al ierforated jacket rotatably. litting said cylini er. ducts or grooves formed in the surface of said plu cross-ports radiating from the center of sai( plug, a discharge-passage intersecting said cross-ports and extending to one end of said plug, a waste-port in the end of said cylinder connected with said discharge-passage, high and low pressure receiving-ports arranged in said cylinder and adapted to connect with the ducts or grooves in said plug,ldischarge or outlet ports in said cylinder adapted to connect with said ducts or grooves and also with said cross-ports, iacking boxes or coiiplingsconnected with said receiving and discharge ports, an annular gage upon said detachable head, index-notches in said gage, and a lever or crank for operating said blug and adapted to beset in said index-notches, substantially as described.

7. A valve of the class described, comprising a cylindricalA casing, a plurality of receiva cylindrical valve-plug journaled in said casing. a tubular jacket mounted upon said valveplug, groups of perforations in said jacket, a duct formed inthe surface of said valve-pliig 5o and a pair of like ducts iii the surface of said valve-pliigadapted to receive a iluid under low pressure, cross ports or passages in said valveplug, acentral waste or discharge passage inwithadischarge-ixirt in the end of said casing,

adapted to receive a fluid under high pressure,-

tersecting with said cross-portsandconnected ing and discharge port-s forined in said casing,' l

a series of packing boxes and couplings ar-- pressure to the top ot the grinding-cylinder, a second portor passage in said pliigor ineinranged on said casing and adapted to foi-inthe ports for the passiige of the liuid to and fi'oiii operate said valve-pliig, and a gage or index said ducts and to said cross-ports, a lever to rforated jacket rotatably liti ceiving and discharge openings, a valve-core ting said cylin er, ducts or grooves formed in the surface of said plug, cross-ports radiating operatively titting said casing, a tight-titting Jacket ineasing said valve-core. spirallyshaped recesses orducts formed in the surface of said valve-core beneath said jacket perforations in said jacket forming inlets and outlets for the tiuid passing tlirou h said receiving and discharge openings an also said recesses or ducts. cross ports or passages coavergingtoward the center of said valve-core, a central discharge-passage intersecting said cross ports or passages,pipes to carry a tluid from the pumps to said valve, pipes to carry a iluid from said valve. to the grinding-cylinder, and also to carr,v said iiiiid back to said valve, packing boxes or couplings adapted to forni pressure-tight connections between said pipes and said valve, a lever connected with said valvecore, a gage or index upon one end ofrsaid casing, adapted by means of said lever to indicat-e a number of ditlcrent positions in which said viilve-core may be set,

`au bstantial ly as described. a

9. The combination with a'griiiding-cylinder and a hollow casing having a detachable head and a high-pressure and a low-pressure receiving-port, of a cylindrical plug jour naled in said casing, having a series of spi. rally-shaped ducts formed in the surface of said plug, one of said ducts adapted to receive a high pressure, and two of said ducts adapted to receive a low pressure, cross-ports converging` toward the center of said plug, a central passage formed longitudinally ot' said plug and iiitei'sectingivitli said cross-mias, a. *Y Y waste-@mrt in the end ot' said casing i n line with said central passage, a jacket inciisiiig said plug and having a group of perforations disposed at the ends of said spiral'ly-shaped ducts and also opposite each of said cross-ports, oppositely-disimsed discharge-ports formed in said casing, pipes connecting a pniiip system withvsaid valve, and pipes connecting said valve with the grinding-cylinder, the latter pipes being adapted to support and hohl said valve in position, an indicator upon one end of said casing, and an operating-lever adapted to engage said indicator, substantially as described.

it). 'elhe combination with a grinding-cylinder, of a valvc` of the class descrilad, comprising a-sutable casing, a rotatable plug or niemvber operatively lltting said easing. ii perforated tiibnlar jacket surrounding said plug or ics IlO

iiieiiibci, a port or passage in said plug or iiieinbeil adapted todirect a lluid under high bei' adapted to directa lluid under low presto indicate the ditlerent positions of said valveplug, substantially as descrilieil.

8. ln combination with a grinding-cylinder,

or passage in said pliig'or ineinber adapted to direct a lluid under loiv i-ii'essure tothe botl toin ol' said cylinder, a series ol' discharge or 65 a valve of the class described, comprising ii l reliei' ports in said plug or member adapted |50 to drain or carry H the water or other lluid l of said plug or core. and an operating-lever from either end of said grinding-cylinder, a levcr operable by hand to change or vary the tiow of either of said pressures. or to prevent the passage of the same .through said valve, and a graduated gage or ring to indicate the state or position ol said valve, substantially as described.

11. A rotary valve of the class described, comprising a cylindrical casing having one open and one closed end, a plurality of receivingand discharge ports formed therein. a core or plug journalcd in said casing, spirallyshaped ducts or recesses formed in the surface of said plug or core, a central discharge passage or duct dispsed longitudinally of said plug or core, cross ports or t ucts converging to and connecting with said central discharge passage or duct. and a tubular jacket or case tightly iltting said plug or core, and having perforations adapted to be disposed between f the ducts and ports of said plug or core and the ports of said easing, substantially as described.

'12. A rotary "alvc of the class described, comprising a hollow casing having a plurality of inlet and outlet ports, a cylindrical plug or core journaled in 'said casing, a series of spirally-shaped recesses or ducts formed in the surface of said core or plug, a central discharge passage or duct extending lengthwise of said :vlug or core, cross ports or passages converg g to and connecting with said cen tral discharge assage or duct. a jacket or tion between said cross-ports and said waste#v casing surrouni ing said plug or core, and a series of perforations in said jacket or casing. adapted to strain a tluid passing from said inlet to said outlet ports, and provided with means for preventing the leakage or escape of the water or other lluid as it passes through said ports and ducts, substantially as described.

A13. A rotary valve of the class described, comprisingacylindrical casing having a wasteport at one end, a series of receiving-ports in 'one side of said casing, o|ipositely-disposed discharge-ports formed lin said casing, a-packing box or coupling secured to said casing and dismissal concentrically witheach of said receiving and dischar e ports, means, comprising a gasket, a fol ower, Aand a gland-nut for preventing the escape or leakage. of n liuid-prcssure around said ports, a valve plug or core journahxl in saidl casing, spirallyshaped grooves orducts l'orlned in the snr` face of said plug or core, adapted to conduct a lluid-pressure from said receiving-mits to said discharge-ports, a series of cross ducts or passages converging toward the center of said plug or core, a central discharge-passage in said plug or core forming a connecport, a perforated tubulin' jacket or casing littlng said plug or core and adapted to operate therewith, a shaft or gudgcon on one end connected to said shaft or gudgeon. substan-v tially as described.

l l-l. In n rotary valve of theclassdescrilnal. i the combination with a cylindrical casing and i a plurality ot receiving and discharge ports. of an oblong cylindrical plug or core ineased in a tubular jacket and adapted to operatively beneath said jacket. discharge' passages or ductsl extending from the outer surface to the center of said plug or core. a discharge or waste passage extending from one end to the middle of said plug or core. groups of perforations arranged on said jacket through which a lluid-pressure is adapted to llow, packingboxes to prevent the leakage of water or other lluid around said receiving and discharge ports, and an operating-lever connected to l5. A rotary valve of the class descrilwd` head secured tliercto,fa cylindrical plug having a perforated jacket rotatably litting sai;l cylinder, ducts or grooves formed in thesurface of said plug, cross-ports radiating from passage'intersecting said cross-lairts and extending to the end of said plug, a port in the end of said cylinder connecting with said central discharge-passage, receiving or inlet ports arranged in said cylinder and adapted to' connect with said duets or grooves, ldiacharge or outlet ports in said cylinder adapted tocounect with said ducts or grooves, and also with said cross-ports, and packing boxes or couplings connected with said receiving and discharge ports, substantially as dcscribed.

lt. A rotary valve of theclass described, comprising a cylinder, a cylindrical plug having a'pert'orated jacket rotatably litting said cylindcr,ductsor grooves formed in thesurface 'of said plug.crossports radiating from theccnter ot' said plug, adischnrge-passagc intersect-- ingsaid cross-portsnnd extending tooneend of said plug. a waste-port in thecnd of said cylinder connectedwith said ilisclnirge-lmssugc, high and low pressure receiving-ports arnect with the ducts vor grmives in said plug. and discharge or outlet ports in said cylinder adapted lto connect with said ductsorgrooves andalso with said cross-ports, substantially as described. I

17. A valve. ol' the classdcscribed, comprising a cylindrical casing, a plurality ol' receiv- -ingand discharging ports` formed ins-aid casing. u c vlimlrical valve-plug journnlcd insaid casing, n tubular intkel mounted upon said vulve-plug'. groups ol'V pcrl'orn'tionsin said jacket,l a duct l'ornnrd in the surface ol" said l valve-plug adapted to .receive a llnidunder l high pressure, and a pair ol' like ducts in the lit the interior of said casing, spirally-shaped recesses or ducts formed In said plug or core said plug or'core, substantially as described.-

the center of said plug, a central discharge ranged in said cylinder and adapted to eon' comprising a cylinder having a detachable i noy vom

surface of said valve-plug adapted to receive ll nation with a hollow easing -having a higha uid under low pressure, cross ports or passages in said valve-plug, and a central waste or discharge. passage intersecting with said cross-ports and connected with a dischargeport in the end of said body, substantially as described.

18. ln combination with a grinding-cylinder, a valve of the 'class described, eonipris ing a hollow casing provided with a series of receiving and discharge openings, a valve-core operatively iitting said casing, a tight-fitting jacket incasingsaid valvccore,spirally-shaped recesses or duets formed iii the surface of said valve-core beneath said jacket, perforations in pressure and a low-pressure receiving-port,

of a cylindrical plug jonrnaled in said casing,

liavinga scricsof spirally-slimed duets formed inthe surface of said plug, one of sind ducts adapted to receive a high pressure, and two of vsaid duets adapted to receive a low pres-v sure. cross-ports converging toward the con ter of said plug, a central passage formed loligitudinally of said plug and intersecting with said cross-ports, a waste-wrt in the end of said easing in line with said central passage, a Jacket incasing said plug and having a group of |mrlorationsdisposed at theI ends ol' said Q .spirally-sliaped ducts and also oppositiI each said jacket forming inlets and outlets for the I charge-mats foriiied in said casing, pipes conlluid passing through said receiving and discharge openings and also said recesses or d nets, cross ports or passages'converging toward the center of said va`lve-core, a central discliargei passage intersecting said cross ports or pasi sages, pipes to carry a ilnid from the paiiips 1 to said valve, and pipes to carry a linid from said valve to the grinding-cylinder, and also to carry said llnid hack to said valve` substantially as described.

19. ln combination with a grinding-cylinder a valve of the class described, the-combiof said cross-ports, opposlely-dislmsed dis- 

